Effect of chlorine on different bacterial groups and effectiveness of the purification of sewage in harvested areas

摘要

Besides microbiological monitoring programs, it is important in shellfish harvesting areas to understand the process of purification of sewage discharged in harvesting areas. The objective of this study was to evaluate the importance of purification,the effectiveness of chlorination, and the influence in these areas. Chlorine produced significant reductions on all studied bacterial groups and reductions were among one and two orders of magnitude, being lower for fecal streptococci and aerobic bacteria at 25 deg C. High quantitative variability was observed with regard to the number of bacteria presents in these waters (W1, W2, W3) but qualitative variability is unknown. Correlation among shellfish samples and W3 (effluent discharged in harvestingareas) was not observed.